What does DN50 steel mean? In particular, what does DN mean?

dn50 diameter refers to the nominal diameter. dn50 = outer diameter -2 * wall thickness. DN refers to the nominal diameter, DN100 means that the nominal diameter of the steel pipe is 100 mm. DN after the value is rounded, DN100 tube does not mean that the diameter is 100mm (usually DN100 tube diameter 114mm diameter 95mm. However, the definition of the individual business standards DN is different. Our company DN Is defined as the nominal diameter, which is a value between the nominal diameter and the nominal diameter. DN100 pipe is also called four-inch tube. This information source

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